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PHYSICAL PARAMETER DISTRIBUTION IN SPIN TRANSITION SYSTEMS DERIVED FROM FORC DATA

R. Tanasa1,* , C. Enachescu1, A. Stancu1, J. Linares2, E. Codjovi2, F. Varret2

Affiliation

  1. “Alexandru Ioan Cuza” University, Faculty of Physics, Iasi, 6600, Romania
  2. Laboratoire de Magnétisme et d’Optique, CNRS-UMR 8634, Versailles 78035 France

Abstract

Spin crossover compounds show a first order phase transition that can be accompanied by a thermal hysteresis. In this paper we present the analogies between this class of substances and magnetic systems with a domain structure. We show the possibilities of study the thermal hysteresis of spin crossover solids using Preisach-type models and of the First Order Reversal Curves (FORC) method. Experimental FORC diagrams were obtained for pure and diluted spin transition system [FexZn1-x(btr)2(NCS)2]H2O, where x governs, through cooperative interactions, the width of the thermal hysteresis loops. A parametrical identification of the distributions corresponding to inter-domains interactions domain size was performed also using an Ising like model..

Keywords

Spin crossover system, FORC method, Preisach model, Ising model.

Submitted at: April 26, 2004
Accepted at: June 10, 2004

Citation

R. Tanasa, C. Enachescu, A. Stancu, J. Linares, E. Codjovi, F. Varret, PHYSICAL PARAMETER DISTRIBUTION IN SPIN TRANSITION SYSTEMS DERIVED FROM FORC DATA, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 551-556 (2004)